Abstract
The Solar Load Ratio (SLR) method of passive solar design analysis, developed at Los Alamos National Laboratory, is evaluated for accuracy in predicting performance within the 10–15% range claimed by its authors. SLR predictions of auxiliary heating requirements, as performed on an Apple II Computer, are compared with actual performances of five passive solar residences in the Roaring Fork Valley of Colorado. The residences were monitored for Class C (non-instrumented) data which is of similar accuracy to the information available to a designer using SLR. Thermal performance of designs including direct gain, thermal storage wall, sunspace and mixed systems are evaluated. It is concluded that a designer using SLR cannot expect accuracy within the 10–15% range because sufficiently accurate input data is not available during the design process.
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